From b36ae2d0e0b0ee9865fdc7e628374853d160b55a Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Wed, 21 Jan 2015 10:52:02 +0100
Subject: An index implementation.

---
 common/index.cpp | 30 ++++++++++++++++++++++++++++++
 common/index.h   | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 common/index.cpp
 create mode 100644 common/index.h

(limited to 'common')

diff --git a/common/index.cpp b/common/index.cpp
new file mode 100644
index 0000000..7b0c682
--- /dev/null
+++ b/common/index.cpp
@@ -0,0 +1,30 @@
+#include "index.h"
+#include <QDebug>
+
+Index::Index(const QString &storageRoot, const QString &name, Akonadi2::Storage::AccessMode mode)
+    : mStorage(storageRoot, name, mode, true)
+{
+
+}
+
+void Index::add(const QByteArray &key, const QByteArray &value)
+{
+    mStorage.startTransaction(Akonadi2::Storage::ReadWrite);
+    mStorage.write(key.data(), key.size(), value.data(), value.size());
+    mStorage.commitTransaction();
+}
+
+void Index::lookup(const QByteArray &key, const std::function<void(const QByteArray &value)> &resultHandler,
+                                          const std::function<void(const Error &error)> &errorHandler)
+{
+    mStorage.scan(key.data(), key.size(), [this, resultHandler](void *keyPtr, int keySize, void *valuePtr, int valueSize) -> bool {
+        resultHandler(QByteArray(static_cast<char*>(valuePtr), valueSize));
+        return true;
+    },
+    [errorHandler](const Akonadi2::Storage::Error &error) {
+        qDebug() << "Error while retrieving value" << QString::fromStdString(error.message);
+        errorHandler(Error(error.store, error.code, error.message));
+    }
+    );
+}
+
diff --git a/common/index.h b/common/index.h
new file mode 100644
index 0000000..aea654a
--- /dev/null
+++ b/common/index.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <string>
+#include <functional>
+#include <QString>
+#include "storage.h"
+
+/**
+ * An index for value pairs.
+ */
+class Index
+{
+public:
+    class Error
+    {
+    public:
+        Error(const std::string &s, int c, const std::string &m)
+            : store(s), message(m), code(c) {}
+        std::string store;
+        std::string message;
+        int code;
+    };
+
+    Index(const QString &storageRoot, const QString &name, Akonadi2::Storage::AccessMode mode = Akonadi2::Storage::ReadOnly);
+
+    void add(const QByteArray &key, const QByteArray &value);
+    // void remove(const QByteArray &key, const QByteArray &value);
+
+    void lookup(const QByteArray &key, const std::function<void(const QByteArray &value)> &resultHandler,
+                                       const std::function<void(const Error &error)> &errorHandler);
+
+private:
+    Q_DISABLE_COPY(Index);
+    Akonadi2::Storage mStorage;
+};
-- 
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